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update demo to use boundary patch

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This commit is contained in:
Mike Reed
2009-10-28 15:38:47 -04:00
parent 37a59807b8
commit 3f14f59ee6
1 changed files with 60 additions and 73 deletions
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133
samples/ApiDemos/src/com/example/android/apis/graphics/BitmapMesh.java
View File

@@ -20,6 +20,7 @@ import com.example.android.apis.R;
import android.content.Context; import android.content.Context;
import android.graphics.*; import android.graphics.*;
import android.graphics.utils.BoundaryPatch;
import android.os.Bundle; import android.os.Bundle;
import android.view.*; import android.view.*;
import android.util.FloatMath; import android.util.FloatMath;
@@ -31,97 +32,83 @@ public class BitmapMesh extends GraphicsActivity {
super.onCreate(savedInstanceState); super.onCreate(savedInstanceState);
setContentView(new SampleView(this)); setContentView(new SampleView(this));
} }
private static class SampleView extends View {
private static final int WIDTH = 20;
private static final int HEIGHT = 20;
private static final int COUNT = (WIDTH + 1) * (HEIGHT + 1);
private final Bitmap mBitmap;
private final float[] mVerts = new float[COUNT*2];
private final float[] mOrig = new float[COUNT*2];
private final Matrix mMatrix = new Matrix();
private final Matrix mInverse = new Matrix();
private static void setXY(float[] array, int index, float x, float y) { private static class SampleView extends View {
array[index*2 + 0] = x; private static final int ROWS = 16;
array[index*2 + 1] = y; private static final int COLS = 16;
}
private BoundaryPatch mPatch;
private float[] mCubics;
private Paint mPaint0;
private Paint mPaint1;
private int mCurrIndex = -1;
public SampleView(Context context) { public SampleView(Context context) {
super(context); super(context);
setFocusable(true); setFocusable(true);
mBitmap = BitmapFactory.decodeResource(getResources(), Bitmap bm = BitmapFactory.decodeResource(getResources(),
R.drawable.beach); R.drawable.beach);
float w = mBitmap.getWidth(); mPatch = new BoundaryPatch();
float h = mBitmap.getHeight(); mPatch.setTexture(bm);
// construct our mesh
int index = 0; float unit = 90;
for (int y = 0; y <= HEIGHT; y++) { mCubics = new float[] {
float fy = h * y / HEIGHT; 0, 0, 1, 0, 2, 0,
for (int x = 0; x <= WIDTH; x++) { 3, 0, 3, 1, 3, 2,
float fx = w * x / WIDTH; 3, 3, 2, 3, 1, 3,
setXY(mVerts, index, fx, fy); 0, 3, 0, 2, 0, 1
setXY(mOrig, index, fx, fy); };
index += 1; for (int i = 0; i < 24; i++) {
} mCubics[i] *= 90;
mCubics[i] += 20;
} }
mPatch.setCubicBoundary(mCubics, 0, ROWS, COLS);
mMatrix.setTranslate(10, 10);
mMatrix.invert(mInverse); mPaint0 = new Paint();
mPaint0.setAntiAlias(true);
mPaint0.setStrokeWidth(12);
mPaint0.setStrokeCap(Paint.Cap.ROUND);
mPaint1 = new Paint(mPaint0);
mPaint1.setColor(0xFFFFFFFF);
mPaint1.setStrokeWidth(10);
} }
@Override protected void onDraw(Canvas canvas) { @Override protected void onDraw(Canvas canvas) {
canvas.drawColor(0xFFCCCCCC); canvas.drawColor(0xFFCCCCCC);
mPatch.draw(canvas);
canvas.concat(mMatrix); canvas.drawPoints(mCubics, mPaint0);
canvas.drawBitmapMesh(mBitmap, WIDTH, HEIGHT, mVerts, 0, canvas.drawPoints(mCubics, mPaint1);
null, 0, null);
} }
private void warp(float cx, float cy) {
final float K = 10000;
float[] src = mOrig;
float[] dst = mVerts;
for (int i = 0; i < COUNT*2; i += 2) {
float x = src[i+0];
float y = src[i+1];
float dx = cx - x;
float dy = cy - y;
float dd = dx*dx + dy*dy;
float d = FloatMath.sqrt(dd);
float pull = K / (dd + 0.000001f);
pull /= (d + 0.000001f);
// android.util.Log.d("skia", "index " + i + " dist=" + d + " pull=" + pull);
if (pull >= 1) { private int findPtIndex(float x, float y) {
dst[i+0] = cx; final float tolerance = 25;
dst[i+1] = cy; final float[] pts = mCubics;
} else { for (int i = 0; i < (pts.length >> 1); i++) {
dst[i+0] = x + dx * pull; if (Math.abs(pts[i*2 + 0] - x) <= tolerance &&
dst[i+1] = y + dy * pull; Math.abs(pts[i*2 + 1] - y) <= tolerance) {
return i*2;
} }
} }
return -1;
} }
private int mLastWarpX = -9999; // don't match a touch coordinate
private int mLastWarpY;
@Override public boolean onTouchEvent(MotionEvent event) { @Override public boolean onTouchEvent(MotionEvent event) {
float[] pt = { event.getX(), event.getY() }; float x = event.getX();
mInverse.mapPoints(pt); float y = event.getY();
switch (event.getAction()) {
int x = (int)pt[0]; case MotionEvent.ACTION_DOWN:
int y = (int)pt[1]; mCurrIndex = findPtIndex(x, y);
if (mLastWarpX != x || mLastWarpY != y) { break;
mLastWarpX = x; case MotionEvent.ACTION_MOVE:
mLastWarpY = y; if (mCurrIndex >= 0) {
warp(pt[0], pt[1]); mCubics[mCurrIndex + 0] = x;
invalidate(); mCubics[mCurrIndex + 1] = y;
mPatch.setCubicBoundary(mCubics, 0, ROWS, COLS);
invalidate();
}
break;
} }
return true; return true;
} }